<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcss.com/jquery/1.11.3/jquery.js"></script>
</head>
<body>
<script>
    $.getJSON('json1.json',function(data){
        var dataNew = data;

        //采用filter过滤
        dataNew.image_size_list = dataNew.image_size_list.filter(function(item){
            return item.ad_class=='N';
        });;
    })
</script>
</body>
</html>